Here's the definition that's on our security deposit page, which doesn't get into the nitty-gritty: Normal wear and tear is a term that Wisconsin law does not define.
(3)Protein Fat-Free Percentage, Protein Fat-Free Content, PFF Percentage, PFF Content or PFF of a product means the meat protein (indigenous to the raw, unprocessed pork cut) content expressed as a percent of the non-fat portion of the finished product.
The Conference for Food Protection (CFP) in 2006 recommended to FDA (2) to incorporate cut tomatoes into the definition of potentially hazardous food (time/temperature control for safety food) in the FDA Food Code (5).